Well, eyecraft fixed this in his post, but I feel that it needs to be mentined, too: make sure to take center of gravity into account. You pic has her leaning a little bit, which distracts the viewer and makes it feel less "natural".
I suggest either distributing the weight evenly between the legs and having the center of gravity also centered, leading to a strong stance,
or having the weight put onto one leg with her leaning on that weight-bearing leg, leading to a more dynamic and natural pose that will give you more freedom to play around with.
As for your chosen background, make sure to choose a palette that contrasts well enough with the subject so as to distinguish the two (by "contrast" I mean the contrast of value).